Some Sims love all things sport. Any kind of physical exercise from throwing axes or footballs to boxing or playing soccer and basketball gets excited. Sims with high body skill are going to be more enthusiastic about sports

If a sports hobby instructor tries to autonomously greet a Sim that's swimming in the swimming pool to build their fitness, the hobby instructor may change into their togs and hop into the pool, despite being unable to greet a Sim while in the swimming pool.